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DERIVATIVES AND HEDGING ACTIVITIES - Classification on Consolidated Statements of Financial Condition (Details) | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2022 USD ($) DerivativeInstrument | Jun. 30, 2021 USD ($) | Jun. 30, 2022 USD ($) DerivativeInstrument | Jun. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) DerivativeInstrument
Cash Flow Hedges |  |  |  |  |
Collateral received against obligations in net asset position |  |  |  |  | $ 4,600,000
Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Loan level derivative income | $ 1,685,000 | $ 559,000 | $ 1,691,000 | $ 2,351,000 |
Interest Rate Swaps Related to FHLBNY Advances [Member] | Designated as Hedging Instrument |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | DerivativeInstrument | 4 |  | 4 |  | 4
Notional amount, assets | $ 150,000,000 |  | $ 150,000,000 |  | $ 150,000,000
Fair value assets | $ 13,497,000 |  | $ 13,497,000 |  | $ 4,358,000
Loan Level Interest Rate Swaps with Borrower (Assets) | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | 10 |  | 10 |  | 98
Notional amount, assets | $ 54,115,000 |  | $ 54,115,000 |  | $ 599,003,000
Fair value assets | $ 882,000 |  | $ 882,000 |  | $ 27,440,000
Loan Level Interest Rate Swaps with Borrower (Liabilities) | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, liabilities | 175 |  | 175 |  | 12
Notional amount, liabilities | $ 1,164,869,000 |  | $ 1,164,869,000 |  | $ 100,774,000
Fair value liabilities | (84,162,000) |  | (84,162,000) |  | $ (53,000)
Posted collateral | $ 0 |  | $ 0 |  |
Loan Level Interest Rate Swaps with Borrower 3 | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, liabilities | DerivativeInstrument |  |  |  |  | 87
Notional amount, liabilities |  |  |  |  | $ 612,610,000
Fair value liabilities |  |  |  |  | $ (12,620,000)
Loan Level Interest Rate Floors with Borrower | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, liabilities | 42 |  | 42 |  | 98
Notional amount, liabilities | $ 332,806,000 |  | $ 332,806,000 |  | $ 599,003,000
Fair value liabilities | $ (8,376,000) |  | $ (8,376,000) |  | $ (27,440,000)
Loan Level Interest Rate Floors with Borrower 2 | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | DerivativeInstrument |  |  |  |  | 33
Notional amount, assets |  |  |  |  | $ 291,990,000
Fair value assets |  |  |  |  | 615,000
Loan Level Interest Rate Swaps with Third-part Counterparties 2 | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, liabilities | 10 |  | 10 |  |
Notional amount, liabilities | $ 54,115,000 |  | $ 54,115,000 |  |
Fair value liabilities | (882,000) |  | (882,000) |  |
Loan Level Interest Rate Swaps with Third-part Counterparties | Designated as Hedging Instrument |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Posted collateral | $ 0 |  | $ 0 |  | $ 0
Loan Level Interest Rate Swaps with Third-part Counterparties | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | DerivativeInstrument |  |  |  |  | 87
Count, liabilities | 175 |  | 175 |  |
Notional amount, assets | $ 1,164,869,000 |  | $ 1,164,869,000 |  | $ 612,610,000
Fair value assets | 84,162,000 |  | 84,162,000 |  | 12,620,000
Posted collateral | 0 |  | 0 |  | $ 14,000,000.0
Loan level interest rate swaps with third party counterparties (Assets) | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | DerivativeInstrument |  |  |  |  | 33
Notional amount, liabilities |  |  |  |  | $ 291,990,000
Fair value liabilities |  |  |  |  | $ (615,000)
Posted collateral | $ 101,600,000 |  | $ 101,600,000 |  |
Loan Level Interest Rate Floors with Third-part Counterparties | Not Designated as Hedging Instrument [Member] |  |  |  |  |
Cash Flow Hedges |  |  |  |  |
Count, assets | 42 |  | 42 |  | 12
Notional amount, assets | $ 332,806,000 |  | $ 332,806,000 |  | $ 100,774,000
Fair value assets | $ 8,376,000 |  | $ 8,376,000 |  | $ 53,000

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